Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/85231
Type of publication: Straipsnis kituose recenzuojamuose leidiniuose / Article in other peer-reviewed editions (S5)
Field of Science: Mechanikos inžinerija / Mechanical Engineering (T009)
Author(s): Ambrulevičius, Rimvydas
Title: Saulės kolektorių sistemos energetinės galimybės
Other Title: Energetic possibilities of solar collectors system
Is part of: Žemės ūkio inžinerija. , [T.] 36, Nr. 4 (2004)
Extent: p. 136-143
Date: 2004
Keywords: Saulės kolektoriai;Šilto vandens ruošimas;Energetiniai parametrai;Sollar collectors;Hot water preparing;Energetic parameters
Abstract: Saulės kolektorių panaudojimas ūkininkų sodybose, gamybiniuose ir poilsiniuose objektuose šiltam vandeniui ruošti yra pakankamai efektyvus, atsižvelgiant į sezoninį jų apkrovimą, sutampantį su maksimaliu saulės apšvietos periodu. Tai leidžia sumažinti tradicinių energetinių išteklių panaudojimą daugiau nei 50%. Didelis tokių sistemų pranašumas yra paprasta ekosploatacija bei automatizuotas valdymas. Savaime suprantama, kad gaunamos energijos kiekis priklauso nuo daugelio atsitiktinių faktorių. Todėl sistemose taikomas šilumos akumuliavimas, o jo trūkumas padengiamas naudojant tradicinius energijos šaltinius. Paprastai galimas gauti energijos kiekis prognozuojamas pagal gaminamų kolektorių bandymuose nustatytus tipinius parametrus idealiomis sąlygomis. Tuo tarpu sistemos efektyvumas ir gaunamas energijos kiekis yra apsprendžiamas ir kolektoriaus, ir sistemos bei naudojamo vandens parametrais ir kiekiais per parą. Todėl tikros sistemos galimybės ir būtini pakeitimai nustatomi realiomis eksploatavimo sąlygomis
The exploitation experiments of solar collectors are described in this article. The object of this research is typical collectors system for preparing hot water. System consist of 3 collectors of APAREL company (total area of absorbers is 5,17 m²), 300 l pump and engine. The profile of collectors is closed. The pressure inside is 2-3 MPa. The experiments system are carried out according ISO standarts. Parameters of the system are established quasi-static regime, after establishing the parameters recommended by producer for controller and collectors. During the experiment, it was established that working regime in experimental system is possible, when there is minimal efficiency of used circulating pump. Water in the system is heated most effectively from 11 to 15 o'clock, and when lighting is more then 800 W/m². The calorif power of collectors in condition is not less then 0,6 W/m² and changes fractionally from 11 to 15 o'clock. When the lighting reduces after 15 o'clock, the heating is minimal. The temperature of accumulated water is kept constant. Maximal temperature, reached in heated water, is 60°C. Optimal size of the container for experimental system is 58-68 l/m² of transparent cover. When the container for accumulation is bigger, the temperature of heated water is lower, though the part of solar energy in balance increases from 5 to 9%. In june-july this system can cover about 80% of total energy demand for water heating for 4-6 persons, and throughout the year - 43%. In comparison with possible received amount of energy in ideal conditions, in exploitation conditions the amount of energy is 8-12% smaller. In order to reach maximal efficiency of the system, it is necessary to make sure the optimal debits in profiles of collectors
Internet: https://hdl.handle.net/20.500.12259/85231
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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